Overview (CICS Transaction Gateway for z/OS v9.2.0.0 Base API)

Packages
Package	Description
com.ibm.ctg.client	Provides base classes for developing Java client applications.
com.ibm.ctg.client.exceptions	Contains exceptions thrown by the Java client API classes.
com.ibm.ctg.intercept	Provides classes for developing CICS Intercept plug-ins that enable ECI, EPI and ESI requests from remote mode applications to be intercepted.
com.ibm.ctg.util	Contains utility classes.

Base API Javadoc provides documentation for the Java client APIs and Intercept plug-ins.

Java client applications

Java client applications can communicate with programs on a CICS server by using base classes for the External Call Interface (ECI), the External Security Interface (ESI) and the External Presentation Interface (EPI). Additionally, EPI support classes are provided for developing applications without requiring a detailed knowledge of 3270 data streams.

Intercept plug-ins

Intercept plug-ins enable ECI, EPI and ESI requests to be intercepted before being sent to CICS. CICS Intercept plug-ins implement the CicsIntercept interface and are called from the Gateway daemon. Gateway Intercept plug-ins implement the GatewayIntercept interface and are called from Java client applications.